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g ownEN. PRESSURE GAGE. Y 4 APPLICATION FILED JULI/21. I9Io..RNEwED AuG.v2o,19Ia. 1,306,245.

Patented J Ime 10,` 1919.

In s

, the tire and may remain there,

-L y STE@ .ATNT

JUNIS A. BOWDEN, 0F LOS ANGELES, CALIFORNIA, ASSIGNOR TOA. SCHRADER SON',

i INCORPORATED, OF N'EW YORK,

NWY., A CORPORATION 0F NEW YORK.

PRESSURE-Geen Application led July 27, 1910, Serial No. 5712176. Renewed August To all whom t may concern:

Be it known that JUNIUs A. BowDnN, a citizen of the United States, residing at Los Angeles, ain the county of Los Angeles and' State of California., have invented a new and useful Pressure-Gage, of which the following is a specification.

This invention relates to pressure gages adapted to be applied to the air valve of a pneumatic tire for determining' the pressure `of air within the tire. In the present inven tion the registering device is capable oi' being removed from the air cylinder so that the registering device may he readily inspected when in a more convenient position than if it had to be inspected while the pressure gage was appliedgtoI the tire.

A. further advantagev of the present invention is that the air cylinder portion ofthe device may be screwed to the valve stem of there being four air cylinders provided for the respective tires of the vehicle, and when it is vdesired to determine the pressure, the registering device may be inserted into the air cylinder which is connected to the tire in which the pressure is to be determined, and when inserted therein Athe registering device will be set to indicate the pressure, after which it may be withdrawn from the air cylinder and inspected'in a favorable position. lt should be understood. however, that the present invention is not confined to the air.

cylinder being always carried bodily by the valve of the tire as the present invention contemplates the air cylinder being used as a gage to be momentarily applied to the valve to determine the' pressure or to be attached thereto and carried bodily by the valve.

Referring to 'thel drawings:

Figure 1 is a longitudinal sectionthrough one form of the invention with the registering device removed.

Fig. 2 is a side elevation of the form shown in Fig. 1 showing the registering device in position ytor registering the pressure.

Fig. 3 is a section on line :vs -m8 Fig. 1.

Fig. 4 is a side elevation of the registering device in detail and partly in section.

Fig. 5 is a perspective of the frictional sleeve of the registering device.

Fig. 6 is a side elevation partly in section of another form of the gage.

Specification of Letters Patent.

end of which is Patented June 10, 1919.

a0, 1918. serial no. 250,753.

In the vform shown in Figs. 1 and 2 the gage comprises an air cylinder 1, the lower formed as a hollow extenslon 2 which is adapted to be applied over the valve stem of the tire, -there being a partition 3 which separates the air cylinder 1 from the extension 2, the partition 3 having a port 4 for the entrancel of air to the cylinder 1, and a washer 5 of'rubber or other packing material is provided on the lower side of the partition' 3 to form an cated at 6, Fig. 6.

lWithin the air cylinder l is a piston 7, and a spring 8 bears against the piston 7, and tends to normally hold it'ncar the lower end of the cylinder l, the upper end of the spring bearing against a disk or end piece 9, which is screwed in the upper end of the air cylinder 1 and by means of which the pressure of the spring 8 maybe regulated. Disk or end piece. 9 has a central perforation which receives a registering device 11 which is in the form of a tube, as clearly shown in Fig. 4, and which is provided with a split sleeve 12 shown in ldetail in Fig. 5, which is slidable on the tube 11, and is frietionally held in any position thereon into which it may be set. The lower end of the indicating device 11 is contracted as shown at 13, which enables the indicating device to be readily slipped through the perforation 10 and placed iu the position shown in Fig. 2. The upper end of the indicating device 11 has a flange 14 to enable it to be easily withdrawn from the air cylinder when desired. A

In use the hollow extension 2 is slipped over the valve stem of the tire and a stud 15 which yprojects below the partition 3, presses down the stem oit the valve which permits air to enter through the port 4 and force up the piston 7 to a position correspending to the extent that the air pressure is capable or" overcoming' the spring 8. The

indicating device 11 having' been pressed iug been removed from the air cylinder, the

figure which is exposed below the sleeve 12 .air tight closure with the valve stern indiwill indicate the pressure. Or if desired,

tube 11 need not be removed at all, as thenurrneral above the sleeve 12 could be used to indicate the pressure, in which event, obviously, the tube 11 would be graduated with a scale to correspond.

If desired, the air cylinder could be screwed to the air valve of the tire as shown the valve, and permit air to enter the air cylinder. And while the leakage past the piston might be very slight it would result in a considerable reduction in pressure after a few days. When used in this manner, to determine the air pressure, the cap 16 would be removed and then the registering device 11 wouldbe inserted. If before the insertion thereof sleeve 12 be placed near the lower end of the registering device 11, during the insertion of the registering device the downward pressure of the same `will re'- vsult in forcing the sleeve 12 upward. After the end of the registering device 11 has been brought in contact with the piston 7, and sleeve 12 has been placed in contact with the top of the disk 9, the registering device with its sleeve l2 may be removed from the air cylinder and held in a convenient position for reading, the cap 16 having been replaced l'on the 'air cylinder for the reasons above of air.

lVhat I claim is:

1. A pressure gage comprising an air cylinder having a part to engage a tire valve or the like, a pressure responsive element in said cylinder, a detachable registering device adapted to be projected slidably into said cylinder, and adaptedto contact with said pressure responsive element in its' various actuated positions, and an-indicator pointed out to prevent further escape frictionally slidable on said registering device at a point without the cylinder.

2. A pressure gage comprising a cylinder,

piston, a partition in the cylinder forming at one end of the cylinder a hollow portion adapted to communicate with the air valve of a pneumatic tire, the partition having a port and a stud adapted to depress the stem ofthe valve, a registering device separate from said piston slidable in the cylinder above the piston and protruding from the end of the cylinder. and a sleeve frietionally slidable on the registering device outside of and adapted to contact with the end of the cylinder, the registering device having indicating marks.

3. A pressure gage comprising an air cylinder, a piston therein, a spring resisting outward movement of the piston, a removable registering device slidable in the cylinder above the piston. and a sleeve slidable on the registering device and adaptedto be moved'against the end of the aircylinder, the registering device having indicating marks. Y

'4. A pressuregage comprising a cylinder,

an end piece at one end of the cylinder having an opening therethrough, a piston in the cylinder, a spring interposed between the piston and end piece, a registering device comprising a bodily removable rod loosely extending through the opening in said end piece, the lower end of the rod being adapted to rest upon the outer surface of the piston, and the outer end thereof projecting beyond the outer end of the cylinder, and a Y sleeve slidable on the rod without the cylinder, the said rod having indicating marks.

In testimony whereof, I have hereunto set my hand at Los Angeles, California this 21st day of July 1910,.

JUNIUS A. BOWDEN.

50 a piston therein, a springfor depressing .the Y 

